Fitting COrvette wheels

[paulk68]

http://factoryreproductions.com/fact...n-Grey-c71.htm
I want to put these wheels on my 68 camaro. I know people run these late model corvette wheels with a spacer is that all that is required? The size i plan on running are 18x8.5 5x4.75+56. i am going to be using the ridetech tru-turn on the front. Any info would be great
thanks